Printing-telegraph receiver



Jan. 26 1926,.

H. L. KRUM mmmmmwennn RECEIVER Filed Julie 13. 1921 ,3 Sheets-Shoot 1 iotentcd Jan. 26, 1926.-

UNETE." STATES ijfsfaqz s PATENT OFFICE.

KQW'ABD L. 331 M, 0E (IHICAGG, ILLINOIfS, ASSIGNfbR, BY MEEJIE ASSIGNMENTS, T0

HOEKBUIkI-EEEIHSOEMIDT COBIORATIQN, OF CHICAGO, ILLINOIS, A CORPORA- TE'DN 015 DELAWARE.

IPEINTING-TELEGR4PH RECEIVER.

Application filed J'une 13, 1921. Serial No. $77,012.

Ti; aZZ whom it may czmcem;

Be it known that Li, Howneo L. KRUM, a citizen of the United States, and a resident of Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements, in Printing-Telegraph Receivers, of which the'following is a. specification.

This invention relates to printingtelegraph receivers having selector mechitiiisin responsive to character signalsthat consist of permutatiooscf positive and negative impulses or of current and no current, ex tending through a definite number, prefer ehly five, time intervals or units. More particularly, the invention J'PliItBS to printing telegraph receivers which are locally timed in operation during each signal interval and are kept in step or in pham with the received signals by suitable start and stop mechanism that arrests the receiver during spacing. intervals at the end of each line signal, and again initiateits operation in response to starting intervals or units at the beginning of each signal. In its prefcrrcd embodiment, the invention relates to typewhcel printers and to start and stop printing telegraph receivers in which the start and stop mechanism and the receiver selector mechanism are controlled by a. single electro-magnet which responds to the line impulses. A printing telegraph re ceiver having the characteristics noted is shown in a prior application filed jointly by liharlcs L. Krum and myself in the United States Patent'Ofiice December 23, 1919, Serial No. 346,948.

The present invention seeks to simplify end improve printing'telegraphrcccivcrs of the sort indicated. and further to provide improvcdstart and stop mechanism therefor which will operate accurately and quickly and without undue strain upon the moving parts. Another object of the invention is to provide :1 start and stop mechanism which is adapted tobc controlled by the same magnot which also controls the receiver selector incchanism. and with which only a relatively small amount'of line current is required.

With these and other objects in view, the invention consists in the features of improvement hereinafter set,forth, illustrated in the preferred form in the accompanying drawings and more particularly pointed out in the appended claims.

In the drawings Fig. 1 is a view proved receiver.

Fig. 2 is a detail section on line 22 of Fi 1. i

. h ig. 3 is a. partial view in elevation of the parts controlled by the receiver magnet, these parts being shown in shifted position. Figs. 3* and there detail views of parts shown in Figs. 1 and 3, Fig. 3* being a section on line a- -a of Fig. 1.

Fig. 4 is a vertical section from front to rear of the receiver with the parts in shift-.

in normal or zero position in Fig 5,.e11d

approaching this position in Fig. 6.

7 is a detail view of one of the fric in elevation of the imtion washers employed in the start and stop mechanism. Figs. 8 and 9 are sections on the lines 8-8 and 9-9 respectively of Fig. 1. g

The frame of the improved receiver comprises a base plate 10 and front and rear sheet metal brackets 11 and 12 secured to the base plate and connected at their upper ends by two horizontal brace bars "13. The main receiver shaft 14 is journalled in ballbearings in the front bracket 12 and a yoke 15" mounted on the rear face of the rear bracket ll, the shaft, as shown, extending through an opening 16 in the upper'portion of the bracket. I As in the construction-sot forth in the prior application referred to, the portion of the main shaft 14 in front of the bracket 12 is provided witlra type wheel 17 and o. toothed wheel 18. These wheels cooperate with .a printing arm 19 pivoted on a stud 20, and having, at its inner end, a tooth. 21 and a stud 22 carrying an impression roller, the tooth and roller being adapted to be engaged respectively with the toothed wheel 18 and the type wheel 17. These parts are engaged, when the inner end of the arm is lifted. by a spring 23 connected to its outer end, but normally the arm is held down with the spring-under tension by a catch. lever 24' which is pivotally mounted intermediate its ends and on the front face of the bracket seekers or selecting spacing end portions.

catch lever in normal position with a shoulder on its lower end engaging a pin 27 on the inner end of the printing arm- 19 and the upper end of the catch lever is adapted to be engaged and operatedloy the lower end of a trip lever 28.

The trip lever is controlled by aset of selecting fingers or seekers 29 that cooperate with two combiner discs 30 and 31 mounted. on the main shaft 14; immediately in rear of the bracket 12. Disc 30 is fixed to a sleeve 32 on the shaft and disc 31 is annular in form and is secured to the outer portion of the disc 30 with a thin sheet metal separating flange 33 flat between the discs. The fingers are formed of sheetmetal stampings and have upper ends of inverted U-shaped fixed to short horizon tal pivotpins 3st rotatably mounted in segmental front and back plates 35 and 36 which are ford to the upper portion of the bracket 12, the rear plate having oft-set An intermediate stop plate 37 is arranged in front of the seekers and has large openings through which the pins 34 and light springs 38 thereon extend. The springs 38 extend between ,the front plate 35 and-the seekers and tend to hold the safne in their normal retracted or rearmost position. The trip lever 28 is also a sheet metal stamping and has an inverted U- shape upper end fixed to a pivot pin 39 that extends th ough the plates 35, 36, and 37. The lever extends downward from its pivot and has an outwardly off-set portion 40 that extends through an opening in the bracket 12 and is adapted to engage the upper end of the catch lever 24. The upper portions of the trip lever and of the seekers have integral contactheads 41 and. tl'iese hc'adsand the pivot pins are arranged in arcs concentric with the shaft 14. A spring 42 conn'ected to the trip lever and to an adjusting screw 43 holds the heads in engagement and with the seekers resting upon the notched peripheries of the combiner discs.

The selecting fingers are adapted to he positioned in accordance with the setting of a series of selectors or plungers 44- which in turn are positioned in accordance with the permutations of the line signals. The selccting plungcrs corresponding in number to the selecting fingers or seekers, there being five in each set, and the plungers are arranged in line with the pivot pins 34. of the seekers and. are slidablv and rotatably mounted in the endsof a. sheet metal bracket 45 which is secured to 1nd projects fore wardly from the upper end of the rear mo in bracket 11.- trans; brace 46 cit ing between the frame bars 13 is connected -to and supports the front end of'the bracket 45. A scr'es of spring fingers 47 lived to the rear end oi the brackets?) extend forwardly f' the oluugers 44 and are provided with transferrin seekers rollers which are arr nged to engage circular beveled flanges 4-8 on the forward end-. of the plungcrs to hold the latter either f}. retracted or in advanced position.

A Ushaped sheet metal member 49 to a spacing block 50 on the rear face of combiner disc 30 has oppositely inclinct and restoring coin lugs 51 1-. 322 which are arrar c to successively eng: the flanges of any of the ativaneed .tiug plu gers and further advance and then coniplc'tel restore or reset s: mo. llhcn any of the plungcrs are thus adva. end. by the transfer cam 51. the corrcsponcing here are n'iovcd from biner disc 30 through agap in the flange 33 into engagement with the combiner disc 31. A sheet metal resetting cam 53 for the sc 'elc crs is arranged opposite the forward portion of the gap in the flange 33 and slightl in advance of the transfer cam 51. At theiend area-1i revolution of the shaft- 14 the cams 53, 51, and act successively to reset the selecting lingers. transfer the setting of the plungers to the fingers and restore the plungcrs. During the succceiling revolution the seekers cooperate with the combiner discs'to print the selected character and the selectors or plungers are positioned to select the Sllfil'PQtllllQ character:

The combiner discs are so notched that the seekers will drop and permit the trip lever to strike and disengage the catch lever, \vlun the selected character is opposite the printing point. The spring 23 then lifts theiuuer end of the printing arm so that the cngnigcment of the toothed wheel 18 will shift the latter and force the paper tape on the impression roller into engagement with the selected chaiacl'er on the type wheel.

es a

19 and the catch lever 24- whcn the machine is rapidly operaterh stops and '61. fixed to the front face of the bracket 12- arc provided. As indicated. in Fig. 0 there is a slight clearance between the stops and the printingarln and catch lever when the arm and lever are in normal position but stated, the sto s serve to prevent or The direct operation of the cat h the pivoted trip lever wl'i ch has liven found to perm speed of operation. The catch lo engagement with comllU on the pivot of the 26 is relatively weak'aseompared with the screws 63 to the front face of the bracket 12. One of these screws forms a pivot and the other extends through a slightly elongated slot in the block. By loosening'the latter screw the block can be adjusted by a screw 64 to take up wear on the resetting lever;

The type'wheel has two sets of type either one of which can be brought into operation by adjusting the wheel slightly relatively to the toothed wheel 18. The type wheel and arm 65 are fixed to a common loose hub 65' on the forwardend of the shaft 14 and the ends of the arm res ectivel engage a spring-held latch 66 an a shi ter 67 which are pivoted uponthe wheel 18. The inner end ofthe shifter is notched to receive the arm and its .outer portion has spaced lugs 68 which are arranged to be engaged by the rounded end of the printer arm'l9 in response to special line signals and thereby 'move the type wheel to either one of two ositions relatively to the toothed wheel. Thelatch 66 has beveled notches for engaging the correspondingly shapedend of the arm 65' to hold the type wheel against accidental movement relatively to the toothed wheel. Preferably also, as shown, the latch 6 has shoulders 69 which positively arrest the shifting movement of the arm 65.

The combiner discs and 31 have blank portions which correspond with the blank portions of the type and toothed wheels 17 and 18. That isto say, when the blank portions of the combiner discs are opposite the selecting fingers and while the blank porcident to sto tipinr the printer.

tions are so located, the operation of the setting and "restoring cams 5L, 52, and 53 are eflected. When the printer is arrested at the end of each operation andagain started in response to the first intervalor unit of the next signal, it should be arrested while the print ng arm is opposite the blank portions of the type and toothed wheels and while the blank portions of the combiner discs are in engagement with the seekers. Preferably the printer is arrested just as the lever 55 completes the resetting move-- ment of the printing arm. In this zero position the cambl is moved slightly. past the fifth selecting plunger and seeker and if the fifth seeker has not been again advanced it might be displaced by the vibration in- There is also some danger that the thirda'ud fourth pins might be d'splaced but the light coil springs 38 on the seeker pins 34 prevent the improper displacement of any of these seekers which have been reset and not again advanced.

The selectors 4A are preferably positioned by a rotary actuator on-the shaft 14. .undgr control .pf a single magnet; As in the construction set forth ,in the application relerrcdto, the actuator comprises an axially movable shuttle-'70 keyed to a sleeve 71 on the shaft. An arm 72 fixed to the forward end of the sleeve is connected by a screw 73 to a gear 74,the latter being fixedto the rear .,end of the sleeve 32 on the shaft. The screw bolt 73 extends through an arc-shaped slot in' the arm 72 so that the sleeve and shuttle can be rotatably adjusted on the shaft. The.

rear end of the shuttle. carries an arm 75 having a roller 76 thereon which is adapted to engage the face of a cam ring 77 whiclr is secured to the rear bracket 11 about the opening 16 therein. The cam ring is provided with a series of five notches through which pins 78 extend and the rear headed ends of the ins engage the lower ends of a series of ve levers 79 that are centrally pivoted on studs 80, and the upper ends of which are arranged to engage the rear ends of the selecting plungers 44. A pin 81 fixed to the arm 7 5 extends through an opening in the arm 72 and a spring 82 on the pin normally holds the r0ller'76 in engagement with the face of the cam 77, the contacting faces of the'.roller and cam being conical to reduce the rolling friction.

the armature is connected to an adjusting screw 88 which extends through a lug on the bracket 15 and a forwardly projecting finger 89 is fixed to the armature by screws 90. The forward upturned end of the finger 89 is adapted to engage the reduced rear end of the shuttle 7 0 in rear of a shoulder 91 there on, to thereby block the axial, selector operating movement of the shuttle and variably control the setting of the selecting plungers 44:. The finger 89 is preferably adjustable for wear and for this reason the screws 90 extend through longitudinal slots therein and "a screw 92 is provided on the armature for adjusting the finger. The receiver mag-- izo net responds to all line impulses ,and can ot' the selector actuator or shuttle. But itthe magnet is deenergized while the'f-rolier passes through one of the notches of the cam rirlg,fthe actuator will not shlft axially far 3 portions ofthe :between this ball-bearing member the form shown,

. lar in form {and is iform starting interval or unit followed by live varied selecting intervals or units either positive and negative or current and no current with spacing intervals betweenthese signals. In zero position the selector actu ator roller 7(5- rests upon the wide space between the first and fifth selector operating pins 78. To insure the proper stopping and again starting of the receiver between s1g nals, the receiver shaft 14 is preferably driven slightly faster than the distant transanitter which imparts the signals to the line,

and the pins 78 are spaced to compensate forthis difi erence in speed and are so located that the roller 76 will register with the notches during the mid-portions of the selecting intervals or units of the line sig nals." The elongated portion of the.-:-'cam ring between the fifth and first pins {78 corresponds to the starting and spacing intervals of the line signals and the normal. or zero position, of the roller 76; can be varied by adjustin' the connection between the arm 72 and lhe ear 74 to take care of the starting lag of e receiver, and the roller line signals.

The main shaft 14 of the receiver is driven from a motor through suitable gearing and an improved start and stop mechanism. In a transverse horizontal shaft 93 is journalled in ball-bearings carried by lugs 94 formed upon and projecting forwardly from the side edges of the bracket 11.; This shaft is adapted to be coupled to the'shaft of a small electric motor. A worm 95 on shaft 92 engages a worm wheel 96 which is fixed to a hub or sleeve 97 loosely mounted on a shaft 98. The shaft and sleeve are journalled in ball-bearings carried by the rear bracket 11 and a small front bracket 99. The sleeve 97 is threaded through the inner member of the ball-bearing on the rear bracket and has a lock nut on its rear end and the hub of the worm wheel 96 is clamped and a shoulder on the sleeve.- The sleeve and a driving clutch member. 100 are thus held against longitudinal movement, but the shaft 08 and a. driven clutch member 101 thereon can shift slightly in longitudinal or axialdirection to engage and disengage the clutch members;

. Phe clutch members are formed of metal and have annular flanges provided -with a large number of fine radially extending teeth, so that they can be positively interlocked in a large number of dilferent pbsitions. The driven clutch member is annusecured to a gear wheel s ze ,as.the gear 74 The driven clutch member and gear 102 are 4 secured to a hub 103 that is wise fixed to the shaft 98,

disc 104 that is fixed to the inner end of the sleeve and a washer 105 of fibre or other lik friction material is interposed between these parts. A spring washer lOtiis interposed between the clutch member and a washer 107 and adjusting and lock nuts 108 threaded on the sleeve are adapted to ad just the tension of the spring Washer, so that the latter holds thecparts of the slip friction coupling Theis ri'nglwa'shere Ofi'iss preferably formed ""ofi af isc of spring steel having segmental edge portions bent in opposite direction, as indicated in Figs. 4 and 7. With this arrangement there is no slip and little wear of the toothed engaging faces ofthe clutch members, but, in starting the parts from normal position of rest, the driving clutch member can yield slightly, if necessaryin order to overcome the inertia of the driving parts of the receiver and so startthe same from aposition of rest without jar-or shock. is pressed rearwardly to close the clutch y'a comparatively strong, quick acting spring 109 (see Fi 4) "interposed between the hub-103 an the inner member of the ball-bearingon bracket 99. Normally the clutch is held open with the spring 109 compressed, by a trip lever 110. his lover is pivotally mounted at its lower end on ayoke 111 having a screw stud 112 extendingthrough and adjustably connected by nuts 113 to the lower portion of the rear bracket 11.. carries a roller 114 which face of an annular (321111115 fixed t0 the rear end of the clutch shaft 98. The working face of the cam has a short so mental recess 116 and is most clearly shown in Fig. 3". p The operation of the trip lever and the engagement and disengagement of the clutch members is controlled by an electro-magnet in response to the starting and spacing intervals of the line impulses, and preferably by the same magnet 83 which controls'the selector mechanism. The armature ofthe magnet controls the trip lever 110 through an improved latch mechanismcomprisin toggle members 117 and 118 and a caste 119. he toggle member 117 is mounted upon one of the pivot pins 86 and the togglemember 118 is U-shaped as shown and ex} tends over and is pivotally connected to the upper endof th provided 4:

engages the rear toggle member pinned or othe1 but the driving clutch member is not fixed to the sleeve 97.'

snugly in engagement.

end of the lever 110 and the forward 117. It is also A U-shaped portion of the lever 45 amount of line current ordinarily employed. 129- Atjthe next succeeding operation, the

inclined lug 120 which is adapted to be enand, as the recess 115 of the cam 116 moves ,gaged by a slight shoulder 121 on the catch past the roller 114, the shaft 98 is forced .119. The latter is in the form of a bell forwardly against the pressure of the spring crank lever, is .pivotally mounted. on .the 109 to open the clutch.

yoke and a hght spring 122 connected 'As the clutch is opened, themoving parts thereto tends to hold it in en the mg 120. .An adjustable agement with are arrested by a stop lug 129 which is ar- 123 mounted on the end of the catch is 131 which is fixed to the hub 103011 the adapted to be enga ed by the end of an offclutch shaft 98 Instead of bein fixed set arm 12.4 fixed t3 the armature 85 of, the position the stop 111E129 is adapted to yield receiver Ina net. A spring 125 connects the slightly. For this purpose it is-monnted' toggle member 117 and a rearwardly pro- 'upon the projecting portion 132 of bfdiscI- 1ectmg arm 126 on the trip lever 110. and 133 which loosely surrounds the sleevedike tends to hold these parts in normal position 11111) of a disc 134. This disc is fixed to the" with the toggle member. engaged in an adrear face the bracket 99 withits hub conjustable top screw 127 carried by a lug 128 centric and spaced from the shaft 98 and on the rear bracket 11. clutch spring 109: A disc"135' of fibre or Normally, as stated, magnet 83 1s enerother suitable friction material is interposed gized and holds its-armature depressed and, between the discs 133 and l'34iand the sleeve catch resist the pressure heavy clutch spring the levera e of the parts friction disc 135 to absorb the momentum of in thenormal or zero position of the receiver hub of the latter disc is threaded to receive the latch mechanism and trip lever hold the "adjusting and locking nuts 1 36 which serve" shaft 98 and the driven clutch member in to adjust and hold a spring; washer 137 forward position shown in Figs. and 4) against-the inner face of the disc 133- This with the roller 114 engag ngthelugh porspring washer is similar in construction to t on of the cam 115 and Wliih the toggle the spring washer 106, and clamps the fricrnembers 117': and 118 slightly above a tion washer 135 between the movable disc straight linemr dead center osition. When 133 and. the fixed disc'134.

the magnet 833s deenergize by the starting The eccentric portion 132 of the disc. 133

unitor'interval of each signal, its armature carries a laterally projecting pin 138 which.

is lifted by its spring and the catch 119 disengages a slot in an arm 139 that is pivoted engagedfrom the lug 120 so that the-toggle to a small bracket 140 on the bascplate.

1118111 direction by the pressure of the clutch spring ranged to engage the periphery of the disc 109 against the trip lever, and this spring 131. When the clutch is opened the lug. I qluickly shifts the shaft 98 forwardly to a 129 engages the stop lug 130. At this time s iglit extentto engage the driven clutch the roller 141 (see Figs. 5 and 6) is OPDO? member wlth the constantly rota-ting drlvsite a recess 142 in the periphery of the disc ing rlutch member. While the toggle and 131 and the stop lug 129 and disc 133 are of the relatively moved slightly against the resistance of the a'butment screw ranged to be engaged-by a lug 130 on a discers can be further flexed in upward This arm carries a roller 141 which is ar- 0 is such that the catch can be isengaged by the moving parts. During this movement I .109 orthe V spacing interval at the end of each signal, the roller114'0n the trip lever drops and, since at this time the line y D to normal, magnet 83 is energized and 1ts portion 132 of,the,d1sc 133 carries a PIVOtQCi- 1 meat witha slight pressure and only a small amount of of the stop lug 129, the roller 141 moves into current 1s required to operate the magnet, the'recess 142 of the disc 131, as shown in so that the latter can be arranged directly Fig. 5, and by itsengagementwith the edge in the line circuit without increasing the of the disc limits the movement of the stop As the main and clutch shafts rotate the caln clisc 131 moves the roller-141 and upper armature of the magnet controls the receiver fio t o 0f the arm 139 outwardly and thereselector mechanism, as described, and dury moves he disc 13-8 and stop 129 backward ing this operation, the extended high portion of the cam holds/'5'- latch mecha- 'guoving parts. In this way the yieldin 'stop nism in the position shown in Fig. 3, and 1s properly set at each operation to arrest the magnet armature is entirely relieved the moving parts of the receiver at the same from any pressure due to the clutch spring point. The lower end of thearm 139 pro togglespring 125. During the {cots downwardly below its pivot and its ower end is adapted to cooperate with the base plate 10 to prevent overthrow of the resetting movement of the stop.

into the short notch or recess 116 of the cam I t In addltlon' to the stop 129 the eccentric is restored moves catch 143 which is pressed by a spring 144 armature dc rcssed the "prinp' I p i a b} against the stop 129. The upper end of the the toggle members 117 and 118 back to normal against the stop 127 .an'd into reengagethe catch 119. The trip leyer 'llfliis thus again locked in normal posltion outwardly which is arranged to be engaged and forced in readiness to again yieldingly arrest the to aslight e xtent by iug on catch has a laterally projecting part 145 start-stop clutch for operating the disc 131 and asthelug 1 30 engages the stop 1:29, the catch part 145 snapsover the upper edge of the lug and prevents rebound of the driven iarts.

The improved start and stop mechanism acts lv'ltll fieltti-lfiby to quickly initiate and arrest the rotary receiver shaft and parts operated thereby, is not subjected to excessive Wear, properly arrests the receiver parts in the same position at the end of each 01 cration and has means for absorbing t c. incr 'a or the driven parts both in starting and stopping the same, so that the start and stop operations are effected Without shock or jar upon the parts. which would be apt to disarrange them. The controlling trip mechanism for the start-and stop clutch, while it permits the use of a relatively strong, quick-acting clutch spring, is so or ranged that it imposes a slight load on the armature of the receiver magnet, and which in consequence can be operated with a small amount of current.

Obviously changes may be made in the details set forth without departure from the essentials of the invention as defined by the claims.

I claim as my invention I 1. In a start stop printing telegraph receiver, a rotary selector member, printing means controlled thereby, a power shaft, a common clutch for operating said selector member and said printing means and com-- prising toothed driving-and driven members, a slip friction clutch yicldingly connecting said driven member to said power shaft, and electromagnetic means responsive to line impulses for controlling said clutch and the operation of said. selector member.

2. In a start-stop printing telegraph rccciver, a rotary selector member, printing means controlled thereby, a pow-er act; itcd,

member and said printing means, stop for arresting. said selector member, means actuated by said clutch at each operation thereof for restorting said stop to normal position, and electromagnetic means responsive to line impulses for controlling said clutch and the operation of said clutch and said selector member.

I 3. In a,start-stop printing telegraph receiver, a rotary selector member, printing means controlled thereby, a power-actuatcd start-stop clutch for-operating said selector member and said printing means and 007mprising toothed driving and driven members, a. yielding stop for arresting said driven rnci'nbcr, means actuated at each operation oi said driven member for restpring said stop to normal position and electromagnetic mcans controlling the engagement and disengagement of said clutch members and the operation of said selector member.

a yielding ing toothed said selector nemesis 4. In a start-stop printing telegraph re ceiver, a rotary selector actuator, printing means controlled thereby, a power shaft, a start-stop clutch for operating said selector actuator and said printing means comprisdriving and driven members, said driving member being yieldingly connected to said shaft, a yielding stop for arresting said driven member, means actuated by said driven member at; each operation thereof for restoring said stop to normal, and electromagnetic means controlling the engagement and disengagement of said clutch members and the operation of said selector member.

5. In a start-stop printing telcgraph rcceivcr, a rotary selector member, printing means controlled thereby, a power-actuated clutch for operating said selcctor member and. said'printing means, a yielding stop for arresting the parts driven by said clutch, a friction brake controlling the movement of said stop, a cam actuated by said clutch at each operation thereof for restoring said stop to normal position and electromagnetic means for initiating and controlling the operation of said selector member.

6. In a start-stop printing telegraph re ceiver, a rotary selector member, printing means controlled thereby, a power shaft, a start-stop clutch for operating said selector member and said printing means and comprising toothed driving and driven .mernbore, a yielding coupling for connectin said driving member to said shaft, :1 yie ding cam actuated by said driven member at each operation thereof for restoring said stop to normal position, and electro-magnetic means controlling the engagement and disengagement of said clutch members and the operation of said selector member.

7. In a printing telegraph receiver, a type Wheel, a cooperating printing member, a set of selectors and a rotary selector actuator controlling the operation of said printing member, a power shaft, a start and stop clutch for rotating said selector actuator and said type wheel, and comprising toothed driving and driven members, said driving member being yieldingly connected to said shaft, a yieldingistop for arrcstin said selector actuator and said means operated by said driven member: for restoring said stop to normal position and line controlled electromagnetic means for controlling the operation of said clutch and said selector actuator.

8. In a printing telegraph receiver, a set of selectors, a rotary actuator for positioning said selectors in different combinations, printing mechanism controlled by said selectors, a power shaft, a common start and stop clutch for operating said actuator and said printing mechanism and comprising electromagnet responsive toothed driving and driven members, said being yieldingly connected to said shaft, a *ielding stop for arresting said driven member, means operated by said driven member for restoring said stop to normal position, a trip for engaging and disengaging said clutch members and an to line impulses and the operation driving member for controlling said trip of said selector actuator.

9. In a printing telegraph receiver, atype wheel a cooperating printing member, a set of selectbrs controlling said printing member, a rotary actuator 'for positioning said selectors, a power shaft, :1 start and stop clutch for rotating said type wheel and said selector actuator and comprising toothed dri 'ing and driven members, said driving member being yieldingly connected to said shaft, a yielding stop for arresting said driven member, said type Wheel and said selector actuator, a cam operated by said driven member forrestoriug said stop to normal position and electromagnetic means responsive to line impulses for controlling said clutch and said selector actuator.

10. In a printing telegraph receiver, a set of selectors, a rotary actuator therefor, a start and stop clutch for said actuator, a trip for said clutch, toggle member controlling said trip, a latch for holding said toggle members in a'slightly off-center position, and an electromagnet responsive to line impulses for releasing said latch and control ling the operation of said selector actuator.

11. In a printing telegraph receiver, a set of Selectors, a rotary actuator spring for closing said clutch, a trip for openin the same, a latch normally holding said trip in operative position, an electrotherefor, a start and stop clutch for said actuator, a

magnet operative in response to line impulses to release said latch and control the operation of said actuator, and means for reflieving the armature of said magnet-from the pressure of said clutch spring during its selector COl'lll'OlllIlg movements.

12. In a printing telegraph receiver, a set of selectors, a rotary actuator movable aXially to set said selectors, a power actuator start and stop clutch for rotating said actuator, a sprlng for closing said clutch, a trip for opening the same, a latch for bolding said, trip in operative position, an electromagnet responsive to line impulses and having an armature arranged to release said latch and arrest the axial, selector operating movements of said actuator, and means for holding said trip and latch disengaged during the actuator controlling movements of said armatur 3. In a telegraph receiver, a type Wheel, a cooperating printing arm, combiner discs! connected to said type wheel, a set of scoliers, a spring actuated trip lever holding said seekers in engagement with said combiner discs, and a pivoted latch lever directly ongaged by said trig lever for holding said printing arm in normal position.

14; In a telegraph receiver, a type Wheel, a cooperating printing member, a set of seekers and cooperating combiner discs to control said printing member, a set of selectors, cams for advancing and resetting said sel .ctors and seekers, a power actuated. start and stop clutch for rotating said type wheel, I'OI'Hl'dTHl discs and earns arranged to be arrested witlrsaid seekers upon blank portions of said combiner discs and springs tending to reset certain of said seekers.

HOWARD L. 'KRUM. 

